C.ITOH 8510A User Manual page 31

11-7. Applicable Connector
Plug (cable side):
Receptacle (printer side):
DB-25 (made by JAE) or the equivalent
DB-2SS (made by JAE) or the equivalent
o
0 0 0
@]
~ 3
12 11
~5 ~4
11-8. Signal Descriptions
(1)
DATA RDY/BSY system (In case of RS232C)
When the printer is operated with DATA READY/BSY system, the following signal lines are
necessary:
1) FG (Frame Ground)
Grounding line for circuit protection.
2) CER (Carrier Error)
(This signal is output by switching the Dip switch.)
When any of the errors (Parity Error, Framing Error or Overrun Error) is detected, this
signal is turned to low level within 1 ms from the stop bit end of received data. When the
host computer continuously transmits codes to the printer without sending the CAN code,
the printer continuously receives codes.
In case the CER line is low level when the printer receives the CAN code or the DC3 code,
or when the printer is deselected by the select switch, this line becomes high level.
Note: In the Bit Image Graphic mode the CAN code and the DC3 code become Bit Image
Graphic data.
When a transmission error occurs in the Bit Image Graphic mode and the CER line
becomes low (high) level, the host CPU does not turn the CER line to high (low)
level until the Bit Image Graphic mode is finished.
3) RD (Received Data)
This is a serial data transmission line to the printer from a host CPU. When no data is trans-
mitted, this line must be in "MARK" state (low level).
7) SG (Signal Ground)
This is a grounding line for the signals.
14) FAULT (Fault)
This signal is low when the printer is abnormal or when deselected. It is high when the
printer is normal and selected.
20) DTR (Data Terminal Ready)
This line becomes a high level while the printer is receiving data.
This line becomes a low level while the printer is not receiving data.
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